My 2005 Dodge Power Wagon on Golden Crack in Moab, UT during the 4th Annual Power Wagons in Moab Event.
Stock Power Wagon except the 35" BFG KM2s. Tires had roughly 18 PSI in them, the front swaybar was disconnected and lockers engaged.
Check out http://www.youtube.com/watch?v=PL40auut4To for SilverWagon05's crossing of Golden Crack in his Power Wagon.